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ejaavso180

Presented at the 100th Annual Meeting of the AAVSO, October 8, 2011; received November 21, 2011; revised January 31, 2012; accepted January 31, 2012

Abstract

The Digital Access to a Sky Century @ Harvard (DASCH) has scanned over 19,000 plates and developed a pipeline to calibrate these plates using existing photometric catalogues. This paper presents preliminary results from the use of the AAVSO Photometric All-Sky Survey (APASS) catalogue releases DR1, DR2, and DR3 for DASCH plate calibration. In the optimum magnitude 10–12 range of the DASCH patrol plates, the median light curve RMS with APASS calibration is 0.10–0.12 magnitude, an improvement from the 0.1–0.15 magnitude median light curve RMS with GSC 2.2.3 calibration.